How do I (25F) deal with competitive SIL (28F)

I (25F) have been dating my bf (25M) for 7 years now. His sister (28F) and her bf (30M) have been together for 5 years.
The 4 of us hang out together quite often - have been sticking around the same circle since covid.
We all always had a good relationship, it was never competitive or anything, the only thing I noticed before was whenever my boyfriend would do something nice for me or take me out, his sister would openly complain to her bf about not doing that for her. That's when I noticed subtle comparisons, but I never put much thought into it.
My bf and I used to travel a lot before covid, once it hit, we slowed down and started saving up more.
Long story short, Fast-forward to now - whenever we see them, they're either talking about money, trying to fish out how much we earn, or over excessively talking about holidays and trips they want to go on - then making comments such as 'you guys aren't as adventurous as you used to be hey'
They would also try to figure out if we are looking for houses, since they are. We are as well, but my boyfriend tells me not to say anything to them. So now we don't really talk about anything that we do or any trips and we'll usually just listen to them talking away about everything.
It's difficult to describe on here, but it's subtle competitiveness I'm noticing that I do not want to be involved in - I feel like in future it'll carry on to weddings, baby showers, having kids... Is it a normal thing with SILs??
How do I stop it now? Do I just ignore it?
! TL;DR! How do I (25F) deal with competitive SIL (28F)


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